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File: behaviour.js

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  Classes of Er. Rochak Chauhan  >  AJAX Poll  >  behaviour.js  >  Download  
File: behaviour.js
Role: Auxiliary data
Content type: text/plain
Description: Javascript Library
Class: AJAX Poll
Process a poll without reloading the poll page
Author: By
Last change:
Date: 16 years ago
Size: 8,151 bytes
 

Contents

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/* Behaviour v1.1 by Ben Nolan, June 2005. Based largely on the work of Simon Willison (see comments by Simon below). Description: Uses css selectors to apply javascript behaviours to enable unobtrusive javascript in html documents. Usage: var myrules = { 'b.someclass' : function(element){ element.onclick = function(){ alert(this.innerHTML); } }, '#someid u' : function(element){ element.onmouseover = function(){ this.innerHTML = "BLAH!"; } } }; Behaviour.register(myrules); // Call Behaviour.apply() to re-apply the rules (if you // update the dom, etc). License: This file is entirely BSD licensed. More information: http://ripcord.co.nz/behaviour/ */ var Behaviour = { list : new Array, register : function(sheet){ Behaviour.list.push(sheet); }, start : function(){ Behaviour.addLoadEvent(function(){ Behaviour.apply(); }); }, apply : function(){ for (h=0;sheet=Behaviour.list[h];h++){ for (selector in sheet){ list = document.getElementsBySelector(selector); if (!list){ continue; } for (i=0;element=list[i];i++){ sheet[selector](element); } } } }, addLoadEvent : function(func){ var oldonload = window.onload; if (typeof window.onload != 'function') { window.onload = func; } else { window.onload = function() { oldonload(); func(); } } } } Behaviour.start(); /* The following code is Copyright (C) Simon Willison 2004. document.getElementsBySelector(selector) - returns an array of element objects from the current document matching the CSS selector. Selectors can contain element names, class names and ids and can be nested. For example: elements = document.getElementsBySelect('div#main p a.external') Will return an array of all 'a' elements with 'external' in their class attribute that are contained inside 'p' elements that are contained inside the 'div' element which has id="main" New in version 0.4: Support for CSS2 and CSS3 attribute selectors: See http://www.w3.org/TR/css3-selectors/#attribute-selectors Version 0.4 - Simon Willison, March 25th 2003 -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows -- Opera 7 fails */ function getAllChildren(e) { // Returns all children of element. Workaround required for IE5/Windows. Ugh. return e.all ? e.all : e.getElementsByTagName('*'); } document.getElementsBySelector = function(selector) { // Attempt to fail gracefully in lesser browsers if (!document.getElementsByTagName) { return new Array(); } // Split selector in to tokens var tokens = selector.split(' '); var currentContext = new Array(document); for (var i = 0; i < tokens.length; i++) { token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');; if (token.indexOf('#') > -1) { // Token is an ID selector var bits = token.split('#'); var tagName = bits[0]; var id = bits[1]; var element = document.getElementById(id); if (tagName && element.nodeName.toLowerCase() != tagName) { // tag with that ID not found, return false return new Array(); } // Set currentContext to contain just this element currentContext = new Array(element); continue; // Skip to next token } if (token.indexOf('.') > -1) { // Token contains a class selector var bits = token.split('.'); var tagName = bits[0]; var className = bits[1]; if (!tagName) { tagName = '*'; } // Get elements matching tag, filter them for class selector var found = new Array; var foundCount = 0; for (var h = 0; h < currentContext.length; h++) { var elements; if (tagName == '*') { elements = getAllChildren(currentContext[h]); } else { elements = currentContext[h].getElementsByTagName(tagName); } for (var j = 0; j < elements.length; j++) { found[foundCount++] = elements[j]; } } currentContext = new Array; var currentContextIndex = 0; for (var k = 0; k < found.length; k++) { if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) { currentContext[currentContextIndex++] = found[k]; } } continue; // Skip to next token } // Code to deal with attribute selectors if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) { var tagName = RegExp.$1; var attrName = RegExp.$2; var attrOperator = RegExp.$3; var attrValue = RegExp.$4; if (!tagName) { tagName = '*'; } // Grab all of the tagName elements within current context var found = new Array; var foundCount = 0; for (var h = 0; h < currentContext.length; h++) { var elements; if (tagName == '*') { elements = getAllChildren(currentContext[h]); } else { elements = currentContext[h].getElementsByTagName(tagName); } for (var j = 0; j < elements.length; j++) { found[foundCount++] = elements[j]; } } currentContext = new Array; var currentContextIndex = 0; var checkFunction; // This function will be used to filter the elements switch (attrOperator) { case '=': // Equality checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); }; break; case '~': // Match one of space seperated words checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); }; break; case '|': // Match start with value followed by optional hyphen checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); }; break; case '^': // Match starts with value checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); }; break; case '$': // Match ends with value - fails with "Warning" in Opera 7 checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); }; break; case '*': // Match ends with value checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); }; break; default : // Just test for existence of attribute checkFunction = function(e) { return e.getAttribute(attrName); }; } currentContext = new Array; var currentContextIndex = 0; for (var k = 0; k < found.length; k++) { if (checkFunction(found[k])) { currentContext[currentContextIndex++] = found[k]; } } // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue); continue; // Skip to next token } if (!currentContext[0]){ return; } // If we get here, token is JUST an element (not a class or ID selector) tagName = token; var found = new Array; var foundCount = 0; for (var h = 0; h < currentContext.length; h++) { var elements = currentContext[h].getElementsByTagName(tagName); for (var j = 0; j < elements.length; j++) { found[foundCount++] = elements[j]; } } currentContext = found; } return currentContext; } /* That revolting regular expression explained /^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/ \---/ \---/\-------------/ \-------/ | | | | | | | The value | | ~,|,^,$,* or = | Attribute Tag */